Step 1: Open SBSettings
Step 2: Tap “Power”, and select “Safe Mode”
Step 3: Once booted into safe mode, tap the status bar when it says “Safe Mode”. This will bring up a prompt; tap “Restart” to restart into normal mode
Step 4: Launch an offending app, and the issue should be resolved

Because iOS 5 is still in development, not all iOS app developers (or jailbreak developers) have updated their apps for the upcoming software update. However, iOS 5 will be available for the general public in the very near future, meaning most applications should be compatible with the firmware soon.
We'll keep you posted.